Use old PSU or buy new PSU for new cheap build?

I'm building my dad a new system, not for playing games. Here are the specs:

HEC 6K28BB8F Black 0.8mm SECC Steel MicroATX Mini Tower Computer Case
ASRock 880GM-LE FX AM3+ AMD 880G Micro ATX AMD Motherboard
AMD Athlon II X3 455 Rana 3.3GHz Socket AM3 95W Triple-Core Desktop Processor ADX455WFGMBOX
Mushkin Enhanced Essentials 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Dual Channel Kit Desktop Memory Model 996586
Seagate Barracuda 7200.12 ST3500413AS 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Microsoft Windows 7 Home Premium SP1 64-bit - OEM
LITE-ON 24X DVD Writer Black SATA Model iHAS424-98 LightScribe Support

I have an older system that I don't use anymore which has an Antec BP500U. One of these:

To save money, instead of buying a new PSU, I thought I could just use the one I have. I've never had a problem with that PSU. I used it for 5 years until I built my current system. I haven't used that system for 3 years. Should I be alright using the old PSU or should I buy a new one?
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